Oh boy. Run! A cheat and a liar. He talks to her in the middle of the night, calls her cute nicknames and sleeps with her because they are still in a relationship. It doesn’t stop him from playing games with you. Cheats on her with you and on you with her. What an “upstanding” guy. If you had sex with this guy, make sure you check for STDs. People like him often spread STDs.

Good luck